If I am buying auto body parts for my 2003 pontiac vibe is it neccesary they be CAPA I noticed these are more expensive why is this?

Wow that is pricy who knew a piece of gray plastic could cause so much trouble thanks for all your help.

yes I beleive so they are grey here is whats left of the front one

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I'm having trouble figuring out what the grey molding on the top of my 2003 pontiac vibe basic model fender is called I need to buy replacement parts are they fender flares or fender molding any help would be great